1795 J. F. Erskine 311 When the uncalcined lime stone is imported, the farmers burn it in what is called clamp-kilns, which are built round or oblong with sods and earth.
1836 V. 408/2 Clamp-bricks..kiln-burnt bricks and marl stocks, as well as Dutch clinkers.
1881 §1152. 539 Clamp-burnt bricks.